It was probably not a surprise to bisexual men, who have long asserted that being attracted to both the opposite sex and the same sex is normal, when a new study came out confirming this.

Researchers at Northwestern University did a study which was published online in the journal “Biological Psychology.”  They relied on stringent criteria for selecting participants by recruiting subjects from online sites specifically catering to bisexuals. They also required participants to have had a sexual experience with at least two people of each sex and a romantic relationship of at least three months with at least one person of each sex.

The evidence proved that some men who identify themselves as bisexual are actually sexually aroused by both women and men.

According to a new Health Department study, women who had unprotected sex with bisexual men accounted for most of the new female HIV cases in New York last year. Of the 647 women diagnosed with HIV in 2012, 480 had sex with infected men.

During the early years of the HIV/AIDS epidemic, many women contracted HIV from having sex with men who carried the deadly virus from drug use. Or the women abused drugs themselves. But in recent years, the transmission of HIV to women has changed. Women are contracting HIV from men who’ve had sex with other men who are infected.

The Centers for Disease Control said that “Men who engage in sex both with men and women can acquire HIV from a male partner and then transmit the virus to female partners.” Unfortunately for the women, they may not have know of their male partners’ sexual activity.